diff --git a/db/migrate/20151020141801_large_files.rb b/db/migrate/20151020141801_large_files.rb
new file mode 100644
index 00000000..b1fe3a1a
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+++ b/db/migrate/20151020141801_large_files.rb
@@ -0,0 +1,29 @@
+# encoding: utf-8
+#
+# Redmine plugin for Document Management System "Features"
+#
+# Copyright (C) 2011-15 Karel Pičman <karel.picman@kontron.com>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+class LargeFiles < ActiveRecord::Migration
+  def up    
+    change_column :dmsf_file_revisions, :size, :bigint, :null => true
+  end
+
+  def down
+    change_column :dmsf_file_revisions, :size, :int, :null => true
+  end
+end
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